Re: [PATCH v7 02/11] proc: add proc_fs_info struct to store proc information

[Oleg Nesterov]

On 01/25, Alexey Gladkov wrote:
>
>  static int proc_init_fs_context(struct fs_context *fc)
>  {
>  	struct proc_fs_context *ctx;
> +	struct pid_namespace *pid_ns;
>
>  	ctx = kzalloc(sizeof(struct proc_fs_context), GFP_KERNEL);
>  	if (!ctx)
>  		return -ENOMEM;
>
> -	ctx->pid_ns = get_pid_ns(task_active_pid_ns(current));
> +	pid_ns = get_pid_ns(task_active_pid_ns(current));
> +
> +	if (!pid_ns->proc_mnt) {
> +		ctx->fs_info = kzalloc(sizeof(struct proc_fs_info), GFP_KERNEL);
> +		if (!ctx->fs_info) {
> +			kfree(ctx);
> +			return -ENOMEM;
> +		}
> +		ctx->fs_info->pid_ns = pid_ns;
> +	} else {
> +		ctx->fs_info = proc_sb_info(pid_ns->proc_mnt->mnt_sb);
> +	}
> +

it seems that this code lacks put_pid_ns() if pid_ns->proc_mnt != NULL
or if kzalloc() fails?

Or, better,

	pid_ns = task_active_pid_ns();

	if (!pid_ns->proc_mnt) {
		ctx->fs_info = kzalloc();
		...
		ctx->fs_info->pid_ns = get_pid_ns(pid_ns);
	}

No?

Oleg.